Difference Between Aggregation And Composition In Java
distinguishing aggregation and composition in Java
Difference Between Aggregation And Composition In Java
In Java, aggregation and composition are both forms of association relationships between classes. Aggregation represents a “has-a” relationship, where one class contains references to another class as part of its own structure, but does not own the other class objects. This means that the contained objects can exist independently and can be shared among multiple classes. On the other hand, composition represents a stronger form of relationship, where one class owns the other class objects and is responsible for their creation and destruction. In composition, the contained objects are part of the whole and cannot exist without the owning class.
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1 - Aggregation and composition in Java are two types of relationships used to establish connections between classes.
2) Aggregation represents a “has a” relationship, where a class has a reference to another class, but the referenced class can exist independently.
3) Composition represents a stronger form of relationship, where a class is made up of other classes and the lifecycle of the contained objects is tightly coupled with the parent object.
4) In aggregation, the child object can belong to multiple parent objects, whereas in composition, the child object is owned by only one parent object.
5) Aggregation is indicated by a single directional association (unidirectional), while composition is indicated by a bidirectional association.
6) Aggregation is ideal for situations where objects can exist independently and are not wholly dependent on another object, while composition is suitable when one object is a part of another object and cannot exist without it.
7) Aggregation is represented by using a reference to another class as a member variable, while composition is usually implemented by creating objects of other classes within the parent class.
8) Aggregated objects can exist even if the parent object is destroyed, but composed objects are destroyed when the parent object is destroyed.
9) Aggregation is more flexible and allows for greater reusability of objects, while composition enforces stronger encapsulation and ensures tighter control over object relationships.
10) It is important for developers to understand the differences between aggregation and composition to design efficient and maintainable object oriented systems.
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